6.6-stable review patch. If anyone has any objections, please let me know.
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From: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com
[ Upstream commit 271e015b91535dd87fd0f5df0cc3b906c2eddef9 ]
If the driver would like to transmit a jumbo frame like 2KiB or more, it should be split into multiple queues. In the near future, to support this, add unmap_addrs array to unmap dma mapping address instead of dma address in each TX descriptor because the descriptors may not have the top dma address.
Signed-off-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Signed-off-by: David S. Miller davem@davemloft.net Stable-dep-of: 0c9547e6ccf4 ("net: renesas: rswitch: fix race window between tx start and complete") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/renesas/rswitch.c | 19 +++++++++++-------- drivers/net/ethernet/renesas/rswitch.h | 1 + 2 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c index 989cfc86098f..b008a44ea6ac 100644 --- a/drivers/net/ethernet/renesas/rswitch.c +++ b/drivers/net/ethernet/renesas/rswitch.c @@ -283,6 +283,8 @@ static void rswitch_gwca_queue_free(struct net_device *ndev, gq->tx_ring = NULL; kfree(gq->skbs); gq->skbs = NULL; + kfree(gq->unmap_addrs); + gq->unmap_addrs = NULL; } }
@@ -321,6 +323,9 @@ static int rswitch_gwca_queue_alloc(struct net_device *ndev, gq->skbs = kcalloc(gq->ring_size, sizeof(*gq->skbs), GFP_KERNEL); if (!gq->skbs) return -ENOMEM; + gq->unmap_addrs = kcalloc(gq->ring_size, sizeof(*gq->unmap_addrs), GFP_KERNEL); + if (!gq->unmap_addrs) + goto out; gq->tx_ring = dma_alloc_coherent(ndev->dev.parent, sizeof(struct rswitch_ext_desc) * (gq->ring_size + 1), &gq->ring_dma, GFP_KERNEL); @@ -786,9 +791,7 @@ static void rswitch_tx_free(struct net_device *ndev) struct rswitch_device *rdev = netdev_priv(ndev); struct rswitch_gwca_queue *gq = rdev->tx_queue; struct rswitch_ext_desc *desc; - dma_addr_t dma_addr; struct sk_buff *skb; - unsigned int size;
for (; rswitch_get_num_cur_queues(gq) > 0; gq->dirty = rswitch_next_queue_index(gq, false, 1)) { @@ -797,18 +800,17 @@ static void rswitch_tx_free(struct net_device *ndev) break;
dma_rmb(); - size = le16_to_cpu(desc->desc.info_ds) & TX_DS; skb = gq->skbs[gq->dirty]; if (skb) { - dma_addr = rswitch_desc_get_dptr(&desc->desc); - dma_unmap_single(ndev->dev.parent, dma_addr, - size, DMA_TO_DEVICE); + dma_unmap_single(ndev->dev.parent, + gq->unmap_addrs[gq->dirty], + skb->len, DMA_TO_DEVICE); dev_kfree_skb_any(gq->skbs[gq->dirty]); gq->skbs[gq->dirty] = NULL; + rdev->ndev->stats.tx_packets++; + rdev->ndev->stats.tx_bytes += skb->len; } desc->desc.die_dt = DT_EEMPTY; - rdev->ndev->stats.tx_packets++; - rdev->ndev->stats.tx_bytes += size; } }
@@ -1535,6 +1537,7 @@ static netdev_tx_t rswitch_start_xmit(struct sk_buff *skb, struct net_device *nd goto err_kfree;
gq->skbs[gq->cur] = skb; + gq->unmap_addrs[gq->cur] = dma_addr; desc = &gq->tx_ring[gq->cur]; rswitch_desc_set_dptr(&desc->desc, dma_addr); desc->desc.info_ds = cpu_to_le16(skb->len); diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h index e62c28a442b9..327873b637d7 100644 --- a/drivers/net/ethernet/renesas/rswitch.h +++ b/drivers/net/ethernet/renesas/rswitch.h @@ -956,6 +956,7 @@ struct rswitch_gwca_queue { /* For TX */ struct { struct sk_buff **skbs; + dma_addr_t *unmap_addrs; }; /* For RX */ struct {